First slide

Benzene

Question

What is the correct IUPAC name of the compound shown below?

Difficult

A

3-(3-bromo-5-hydroxy phenyl) benzonitrile
B

5-bromo-3-(3-cyanophenyl) phenol
C

3-(3-hydroxy-5-bromophenyl) benzonitrile
D

3 -bromo-5 -(3-cyanophenyl) phenol

Solution

$- C N$ has higher priority than $- O H$ group, hence the phenyl ring containing $- C N$ is the parent ring. In the locant ring, both $- O H a n d - B r$ are equidistant from the branch point, hence numbering is done in alphabetical order giving lower number to bromo substituent as:

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